Reliability and Magnitude of Countermovement Jump Performance Variables: Influence of the Take-off Threshold

Alejandro Pérez-Castilla, F Javier Rojas, John Fernandes, Amador Garcia-Ramos

Research output: Contribution to journalJournal Articlepeer-review

Abstract

This study explored the influence of different take-off thresholds on the reliability and magnitude of countermovement jump (CMJ) performance variables. Twenty-three men were tested on two separate sessions. CMJ performance variables were obtained against three external loads (0.5–30-60 kg) using three take-off thresholds: 10 N (arbitrary value of 10 N), 5SD (mean value plus 5 standard deviations of the vertical force recorded during the flight phase), and PRF (peak difference between the vertical force trace and 0 N during the flight phase). No significant differences in reliability were observed between the three thresholds (CV and ICC values of one threshold were within 95% CI of the other thresholds). The magnitude of the variables generally differed between the 10 N threshold and the 5SD and PRF thresholds (P < .05), but not between the 5SD and PRF thresholds (P > .05). These results demonstrate that the take-off threshold influences the magnitude of CMJ performance variables but not their reliability.
Original languageEnglish
Pages (from-to)227-235
Number of pages9
JournalMeasurement in Physical Education and Exercise Science
Volume25
Issue number3
Early online date15 Jan 2021
DOIs
Publication statusPublished - 3 Jul 2021

Keywords

  • Force platform
  • kinematic
  • kinetic
  • vertical jump
  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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